Xcode update kills Qt

[ModelTech]

I just installed an update of XCode to version 9.0. As a result of this, I get an error when trying to compile my application that worked perfectly well before. The error is:

Qt/5.9.1/clang_64/lib/QtCore.framework/Headers/qsystemdetection.h:95: error: 'TargetConditionals.h' file not found
#  include <TargetConditionals.h>
           ^~~~~~~~~~~~~~~~~~~~~~

I have tried to update Qt with the Maintenance Tool but this did not resolve the issue. How should I solve this?

[kshegunov]

https://forum.qt.io/topic/83447/made-the-mistake-of-updating-xcode

[ModelTech]

Ok. Solution was to remove my existing Qt5.9.1 and install Qt5.9.2...